CN110514907B - Air transmission measuring system for wireless communication device - Google Patents
Air transmission measuring system for wireless communication device Download PDFInfo
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- CN110514907B CN110514907B CN201810485937.0A CN201810485937A CN110514907B CN 110514907 B CN110514907 B CN 110514907B CN 201810485937 A CN201810485937 A CN 201810485937A CN 110514907 B CN110514907 B CN 110514907B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
- G01R29/105—Radiation diagrams of antennas using anechoic chambers; Chambers or open field sites used therefor
Abstract
An aerial transmission measurement system for a wireless communication device comprises an anechoic chamber, a device to be tested, at least one first test antenna and a plurality of second test antennas. The device to be tested is provided with at least one antenna to be tested and is arranged in the anechoic chamber. The first test antenna is arranged in the anechoic chamber and is away from the device to be tested by a first far-field distance, and the electromagnetic wave signal sent by the first test antenna is used for representing the sight line electromagnetic wave signal provided by the wireless signal source to the device to be tested. The plurality of second test antennas are arranged in the anechoic chamber and are at a second far-field distance away from the device to be tested, the second far-field distance is smaller than the first far-field distance, and the electromagnetic waves emitted by the plurality of second test antennas are used for representing multi-path electromagnetic wave signals provided for the device to be tested by the wireless signal source. Therefore, the measurement in the anechoic chamber can be closer to the actual application situation.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to an air transmission measurement system for a wireless communication device.
Background
The wireless communication device is required to be provided with an antenna and utilize electromagnetic waves to carry out information transmission, The transmission efficiency obtained in various practical application scenes is obviously different due to The transmission characteristics of The electromagnetic waves, but based on The performance limitation of The antenna and The product development cost, The wireless communication device cannot be measured in The practical application scenes one by one, and The Over The Air (OTA) test in an anechoic chamber is a performance test mode with lower cost.
Antenna tests traditionally performed in anechoic chambers have free space (free space) as a reference environment to present parameters such as radiation pattern, isolation, gain, etc. Furthermore, the transmission performance test of the wireless communication device in the anechoic chamber is also only applicable to the Line of Sight (LOS) condition without reflection, and does not meet the multi-path (multi-path) effect of the real application environment. The actual performance of the product is often different from the laboratory test of the product, and if a performance test result closer to the actual application condition needs to be obtained, the test needs to be performed in the space of the actual field, but due to the high cost, the industry still needs a lower-cost and more efficient test method.
Disclosure of Invention
The embodiment of the invention discloses an aerial transmission measuring system of a wireless communication device, which comprises an anechoic chamber, a device to be tested, at least one first testing antenna and a plurality of second testing antennas. The device to be tested is provided with at least one antenna to be tested and is arranged in the anechoic chamber. The at least one first test antenna is arranged in the anechoic chamber and is away from the device to be tested by a first far-field distance, the at least one first test antenna and the at least one antenna to be tested of the device to be tested directly transmit electromagnetic wave signals, and the electromagnetic wave signals sent by the at least one first test antenna are used for representing sight line electromagnetic wave signals provided for the device to be tested by a wireless signal source. The plurality of second test antennas are arranged in the anechoic chamber and are at a second far-field distance away from the device to be tested, the second far-field distance is smaller than the first far-field distance, the plurality of second test antennas and at least one antenna to be tested of the device to be tested directly transmit electromagnetic wave signals, and the electromagnetic waves emitted by the plurality of second test antennas are used for representing multi-path electromagnetic wave signals provided for the device to be tested by the wireless signal source.
Preferably, the number of the plurality of second test antennas is more than three, and the plurality of second test antennas surround the periphery of the device to be tested.
Preferably, the wireless communication device over-the-air measurement system further comprises a mimo network analyzer, a vector network analyzer, a switch and a computer. The MIMO network analyzer is connected to the at least one first test antenna, the plurality of second test antennas and the at least one antenna under test of the device under test, and has a software defined radio. The vector network analyzer is connected with the at least one first test antenna and the at least one antenna to be tested of the device to be tested. The switch is connected between the at least one first test antenna and the multiple-input multiple-output network analyzer, and connected between the at least one first test antenna and the vector network analyzer, and is used for controlling the switching condition of the at least one first test antenna. The computer is connected with the multiple-input multiple-output network analyzer, the vector network analyzer and the switch, controls the multiple-input multiple-output network analyzer, the vector network analyzer and the switch, and is used for capturing the measured data, wherein the computer controls the phase, the time delay and the signal intensity of a wireless transmitting signal of the multiple-input multiple-output network analyzer according to the input instruction of the user interface, and the wireless transmitting signal is divided into a sight line electromagnetic wave signal and a multiple path electromagnetic wave signal and is used for being respectively provided to the at least one first test antenna and the plurality of second test antennas.
Preferably, the over-the-air transmission measurement system of the wireless communication device further comprises a channel simulator, and the mimo network analyzer is connected to the plurality of second test antennas through the channel simulator.
Preferably, the aerial transmission measurement system of the wireless communication device further comprises a rotary table and a rotary table controller, the device to be measured is arranged on the rotary table in the anechoic chamber, the rotary table is connected with the rotary table controller, and the rotary table controller is connected with the computer.
Preferably, the vector network analyzer is used for measuring total radiation power, total omnidirectional sensitivity, equivalent omnidirectional radiation power and radiation pattern.
Preferably, the multiple-input multiple-output network analyzer transceives non-signaling wireless signals for throughput testing.
Preferably, the position of the plurality of second test antennas relative to the device under test is adjustable, and the distance between the plurality of second test antennas and the device under test is adjustable.
Preferably, the positions of the plurality of second test antennas and the distance from the device under test are adjusted according to a channel model.
Preferably, the device under test is a notebook computer, a laptop computer, a tablet computer, a one-piece computer, a smart television, a small base station, a wireless router, or a smart phone.
To sum up, unlike the conventional measurement system, the air transmission measurement system of the wireless communication device according to the embodiment of the present invention not only can measure the far-field radiation pattern of the antenna of the wireless communication device, but also can simulate two signals of the wireless communication device in the practical application situation of the external wireless signal source (or wireless transmission object) in the hardware environment, wherein the two signals are measured by using the first test antenna to represent the antenna for line-of-sight transmission and using the second test antenna to represent the multi-path signal measurement reflected by the environment.
Drawings
Fig. 1 is an architecture diagram of an over-the-air measurement system of a wireless communication device according to an embodiment of the present invention.
Fig. 2 is a schematic configuration diagram of an anechoic chamber according to an embodiment of the present invention.
Detailed Description
The air transmission measurement system of the wireless communication device of the embodiment of the invention is used for measuring the wireless transmission performance of a device to be measured, such as a notebook computer, a laptop computer, a tablet computer, an all-in-one computer, a smart television, a small base station, a wireless router or a smart phone. Referring to fig. 1 and 2, fig. 1 is an architecture diagram of an aerial transmission measurement system of a wireless communication device according to an embodiment of the present invention, and fig. 2 is a configuration diagram of an anechoic chamber according to an embodiment of the present invention. The air transmission measurement system of the wireless communication device comprises an anechoic chamber 1, a device to be tested 2, at least one first test antenna 31 and a plurality of second test antennas 32. The device under test 2 (which may be referred to generally as a DUT) has at least one antenna under test 21 disposed within the anechoic chamber 1, such as a turntable 9 disposed within the anechoic chamber 1. The at least one first test antenna 31 is disposed in the anechoic chamber 1 and at a first far-field distance d1 from the device under test 2, the first test antenna 31 and the antenna under test 31 of the device under test 2 directly transmit electromagnetic wave signals to each other, and the electromagnetic wave signals emitted by the first test antenna 31 are used to represent Line of Sight (LOS) electromagnetic wave signals provided by a wireless signal source to the device under test 2, which are hereinafter referred to as LOS signals. The number of the antennas 21 to be tested may be plural, and the number of the first test antennas 31 may also be plural. Furthermore, the plurality of second test antennas 32 are disposed in the anechoic chamber 1 and are at a second far-field distance d2 from the device under test 2, the second far-field distance d2 is smaller than the first far-field distance d1, the plurality of second test antennas 32 and the antenna under test 21 of the device under test 2 directly transmit electromagnetic wave signals to each other, and the electromagnetic waves emitted by the plurality of second test antennas 32 are used for representing multi-path electromagnetic wave signals (MUT-path signals), hereinafter abbreviated as MUT signals, provided to the device under test 2 by the wireless signal source.
Referring to fig. 1, in terms of signal and data processing, the air transmission measurement system further includes a multiple-Input multiple-Output (MIMO) network analyzer 4a, a vector network analyzer 4b, a switch 5, a turntable controller 6 and a computer 7. The computer 7 is connected to the mimo network analyzer 4a, the vector network analyzer 4b and the switch 5, and controls the mimo network analyzer 4a, the vector network analyzer 4b, the switch 5 and the turntable controller 6 for controlling the measurement process and capturing the measurement data. The turntable 9 is connected with the turntable controller 6, and the turntable controller 6 is used for controlling the turntable 9 so that the device to be tested 2 arranged on the turntable 9 can rotate in situ. The mimo network analyzer 4a has Software-Defined Radio (SDR) and artificial intelligence algorithm for assisting antenna measurement and parameter analysis, and the vector network analyzer 4b may be a general commercially available vector network analyzer. The mimo network analyzer 4a is connected to the first test antenna 31, the second test antenna 32 and the antenna 21 of the device under test 2, wherein the mimo network analyzer 4a can be connected to the second test antenna 32 through the channel simulator 8, or directly connected to the second test antenna 32 without the channel simulator 8. The channel simulator 8 has the functions of phase adjustment, time delay, signal attenuation and the like on signals, and the channel simulator 8 can also be connected with and controlled by the computer 7. The vector network analyzer 4b connects the first test antenna 31 and the antenna to be tested 21. The switch 5 is connected between the first test antenna 31 and the mimo network analyzer 4a, and between the first test antenna 31 and the vector network analyzer 4b, and is controlled by the computer 7 to control the switching status of the first test antenna 31. The computer 7 controls the phase, time delay and signal strength of the wireless transmission signal of the mimo network analyzer 4a according to the input instructions of its user interface (not shown). The wireless transmission signal of the mimo network analyzer 4a is divided into LOS signal and MUT signal, and is provided to the first test antenna 31 and the second test antenna 32, respectively. Furthermore, the switch 5 can also be connected to a commercially available mimo base station 4c (or wireless network Access Point), so as to replace the mimo network analyzer 4a with a transceiver of a real product.
Referring to fig. 1 and 2, the first test antenna 31 and the second test antenna 32 are movably disposed. The orientation of the plurality of second test antennas 32 relative to the device under test 2 is adjustable, and the distance between the plurality of second test antennas 32 and the device under test 2 is also adjustable, for example, the position of the second test antenna 32 and the distance from the device under test 2 are adjusted according to a predetermined channel model, the type of the channel model used may be changed, and the invention is not limited thereto. The number of the second test antennas 32 is, for example, three or more, and these second test antennas 32 surround the periphery of the device under test 2. When operating in the far-field measurement, the anechoic chamber 1 should satisfy the far-field condition, and the first far-field distance and the second far-field distance should both satisfy the far-field condition, i.e., the first far-field distance D1 and the second far-field distance D2 are both greater than or equal to 2D2λ, where D is the maximum size (or antenna diameter) of the antenna to be measured and λ is the wavelength of the electromagnetic wave. Amount of products and internet of things (IoT) devices in response to fifth generation mobile communication (5G) technologyThe measurement requirements can be divided into three measurement modes: (a) passive testing: the vector network analyzer 4b is responsible for receiving and transmitting wireless signals between the first test antenna 31 and the antenna 21 to be tested, and completes the traditional antenna parameter measurement, including: total Radiated Power (TRP), Total Isotropic Sensitivity (TIS), Effective Isotropic Radiated Power (EIRP), and Radiation Pattern (Radiation Pattern). (b) General active testing: the first test antenna 31 is used for communicating with the antenna 21 to be tested of the device 2 to be tested, the mimo network analyzer 4a receives and transmits non-signaling (non-signaling) wireless signals to perform throughput (throughput) test, or the mimo network analyzer 4a is replaced by the mimo base station 4c to perform the test directly with the existing product, and the device 2 to be tested is regarded as the terminal device. (c) And (3) compound active test: including a receive mode (Rx) and a transmit mode (Tx), and with non-signaling radio signals for throughput testing. In the receive mode (Rx), the first test antenna 31 and the second test antenna 32 are used as signal transmitting terminals simultaneously to perform wireless signal transmission to the antenna to be tested 21 (receiving terminal). The transmission mode (Tx) is to use the antenna under test 21 as a signal transmitting end and simultaneously perform wireless signal transmission to the first test antenna 31 (receiving end) and the second test antenna 32 (receiving end). The first test antenna 31 and the second test antenna 32 have the signal types represented by them, regardless of the reception mode (Rx) or the transmission mode (Tx). Taking the receiving mode (Rx) as an example, the first test antenna 31 represents a LOS signal transmitted by a remote base station without reflection, and the second test antenna 32 represents a MUT signal transmitted by the remote base station to the vicinity of the device under test 2 and reflected at least once (or multiple times). The reason for the two kinds of signal sources represented by the test antenna is that, compared to the actual application environment of the wireless communication product, the remote base station can directly transmit the signal to the device under test 2, but this is established under the condition that there is no barrier or obstacle between the two, and unless the device under test 2 is very close to the remote base station, the remote base station is mostly facing to the remote base stationWhen the device 2 to be tested sends a signal to the device 2 to be tested, a part of signals (the signals with the straight line transmission being subtracted) must be reflected at least once to reach the device 2 to be tested, so that the signals from the remote base station are distinguished into LOS signals and MUT signals, the LOS signals only account for a part of the total signal intensity sent by the remote base station, the MUT signals also only account for a part of the total signal intensity sent by the remote base station, and the sum of the LOS signals and the MUT signals may be the sum of all the signals sent by the remote base station or less than the sum of all the signals sent by the remote base station (some signals cannot reach the device 2 to be tested). According to the distance between the device under test 2 and the remote base station and the environment of the obstacle between the two, so that the environment around the device under test 2 can cause signal reflection, the LOS signal and the MUT signal actually reach the position of the device under test 2, and the strength, time delay and phase of the signal received by the device under test 2 are obviously different. In an exemplary case, when the channel model is to represent no obstacle between the device under test 2 and the remote base station, the LOS signal is not zero, and the ratio of the LOS signal emitted by the first test antenna 31 to the MUT signal emitted by the second test antenna 32 is adjustable according to the environmental reflection to be simulated, and when the strength of the MUT signal increases, the environmental reflection increases. In another exemplary case, the LOS signal may be zero and only the MUT signal when the channel model is to represent an obstacle between the device under test 2 and the remote base station. This way of using the first test antenna to represent the LOS signal and the second test antenna to represent the MUT signal is to reconstruct the channel model in hardware in the (darkroom) space, which can replace the channel simulator device conventionally simulated by software algorithm.
To sum up, unlike the conventional measurement system, the air transmission measurement system of the wireless communication device according to the embodiment of the present invention not only can measure the far-field radiation pattern of the antenna of the wireless communication device, but also can simulate two signals of the wireless communication device in the practical application situation of the external wireless signal source (or wireless transmission object) in the hardware environment, wherein the two signals are measured by using the first test antenna to represent the antenna for line-of-sight transmission and using the second test antenna to represent the multi-path signal measurement reflected by the environment.
The above description is only an example of the present invention, and is not intended to limit the scope of the present invention.
Reference numerals
1: anechoic chamber
2: device under test
21: antenna to be tested
31: first test antenna
32: second test antenna
4 a: multiple input multiple output network analyzer
4 b: vector network analyzer
4 c: multiple-input multiple-output base station
5: switch device
6: rotary table controller
7: computer with a memory card
8: channel emulator
9: rotary table
Claims (10)
1. An over-the-air measurement system for a wireless communication device, comprising:
an anechoic chamber;
a device to be tested, which is provided with at least one antenna to be tested and is arranged in the anechoic chamber;
the at least one first test antenna is arranged in the anechoic chamber and is far away from the device to be tested by a first far field distance, the at least one first test antenna and the at least one antenna to be tested of the device to be tested directly transmit electromagnetic wave signals, and the electromagnetic wave signals sent by the at least one first test antenna are used for representing a sight line electromagnetic wave signal provided by a wireless signal source to the device to be tested; and
the second testing antennas are arranged in the anechoic chamber and are away from the device to be tested by a second far-field distance, the second far-field distance is smaller than the first far-field distance, the second testing antennas and the at least one antenna to be tested of the device to be tested directly transmit electromagnetic wave signals, and the electromagnetic waves emitted by the second testing antennas are used for representing a multi-path electromagnetic wave signal provided for the device to be tested by the wireless signal source.
2. The system of claim 1, wherein the number of the second test antennas is more than three, the second test antennas surrounding the periphery of the device under test.
3. The wireless communication device air transmission measurement system of claim 1, wherein the wireless communication device air transmission measurement system further comprises:
a MIMO network analyzer connecting the at least one first test antenna, the plurality of second test antennas and the at least one antenna under test of the device under test, the MIMO network analyzer having a software defined radio;
a vector network analyzer connecting the at least one first test antenna and the at least one antenna to be tested of the device to be tested;
a switch connected between the at least one first test antenna and the multiple-input multiple-output network analyzer, and connected between the at least one first test antenna and the vector network analyzer for controlling the switching status of the at least one first test antenna; and
a computer connected to the mimo network analyzer, the vector network analyzer and the switch for controlling the mimo network analyzer, the vector network analyzer and the switch to capture the measurement data, wherein the computer controls the phase, time delay and signal strength of the wireless transmission signal of the mimo network analyzer according to an input instruction of a user interface, and the wireless transmission signal is divided into the line-of-sight electromagnetic wave signal and the multi-path electromagnetic wave signal for being provided to the at least one first test antenna and the second test antennas, respectively.
4. The system of claim 3, further comprising a channel simulator, wherein the MIMO network analyzer is coupled to the second test antennas via the channel simulator.
5. The system of claim 3, further comprising a turntable and a turntable controller, wherein the DUT is disposed on the turntable in the anechoic chamber, the turntable is connected to the turntable controller, and the turntable controller is connected to the computer.
6. The system of claim 1, wherein the vector network analyzer is configured to measure total radiated power, total omnidirectional sensitivity, equivalent omnidirectional radiated power, and radiation pattern.
7. The system of claim 1, wherein the mimo network analyzer receives and transmits non-signaling wireless signals for throughput testing.
8. The system of claim 1, wherein the second test antennas are adjustable in position relative to the dut and in distance from the dut.
9. The system of claim 1, wherein the positions of the second test antennas and the distances from the dut are adjusted according to a channel model.
10. The over-the-air transmission measurement system of claim 1, wherein the device under test is a notebook computer, a laptop computer, a tablet computer, a all-in-one computer, a smart television, a small base station, a wireless router, or a smart phone.
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| CN111342198B (en) * | 2020-03-17 | 2021-04-23 | 珠海微度芯创科技有限责任公司 | Wireless feed system for antenna measurement |
| CN112865885B (en) * | 2021-01-06 | 2022-11-01 | 常熟市泓博通讯技术股份有限公司 | Antenna signal and radiation pattern analysis system |
| TWI768646B (en) * | 2021-01-06 | 2022-06-21 | 泓博無線通訊技術有限公司 | Antenna signal and radiation pattern analysis system |
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